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Related Experiment Videos

Chemical sensors based on controlled-release polymer systems.

S M Barnard1, D R Walt

  • 1Department of Chemistry, Tufts University, Medford, MA 02155.

Science (New York, N.Y.)
|February 22, 1991
PubMed
Summary
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Analytical chemistry·2011

A new chemical sensor uses ethylene-vinyl acetate polymer for controlled reagent release in optical fiber assays. This enables continuous, long-term measurement of solution antigen concentration using fluorescence energy transfer.

Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Materials Science

Background:

  • Developing continuous monitoring chemical sensors is crucial for real-time diagnostics.
  • Traditional sensors often face limitations with reagent depletion and sensor longevity.
  • Homogeneous competitive immunoassays offer sensitive detection but require efficient reagent delivery.

Purpose of the Study:

  • To develop a novel chemical sensor utilizing a polymer-based controlled-release system.
  • To enable continuous measurement of solution antigen concentration.
  • To demonstrate the applicability of irreversible indicating chemistries in long-term chemical sensing.

Main Methods:

  • Utilized ethylene-vinyl acetate as a controlled-release matrix for sensor reagents.

Related Experiment Videos

  • Integrated the polymer system with an optical fiber for reagent delivery to the sensing region.
  • Employed a homogeneous competitive immunoassay based on fluorescence energy transfer (FRET).
  • Used a model system with fluorescein-labeled antibody and Texas Red-labeled immunoglobulin G (IgG).

    • Main Results:

    • Successfully demonstrated a controlled-release system for reagents in an optical fiber chemical sensor.
    • Enabled continuous measurement of antigen concentration through a competition reaction.
    • Showcased the potential for using irreversible indicating chemistries for prolonged sensor operation.
    • Presented data from a model system validating the sensor's principle.

    Conclusions:

    • The developed chemical sensor, using ethylene-vinyl acetate for controlled reagent release, facilitates continuous antigen concentration monitoring.
    • The technique broadens the application of irreversible chemistries in long-term sensing devices.
    • Further optimization of the sensor configuration can enhance its performance for various analytical applications.